"Black lives of course matter. And I've spent 50 years of my life fighting for civil rights and for dignity," Sanders responded.

Despite what he says is a good record on race, Sanders isn't doing well with black voters. In a poll by NBC and The Wall Street Journal, Sanders received only 3 percent of support from non-white voters. (Video via Bernie Sanders)

However, Sanders seems to be handling the protests better than some of his rivals. Democrat Martin O'Malley has had to apologize after his own run-in with protestors.

"Black lives matter. White lives matter. All lives matter," O'Malley said before being booed by protesters.